* [davidhildenbrand:folded_pgtable 13/13] include/asm-generic/pgtable-nop4d.h:46:36: error: call to undeclared function 'pgd_val'; ISO C99 and later do not support implicit function declarations
@ 2026-07-04 2:39 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-07-04 2:39 UTC (permalink / raw)
To: David Hildenbrand (Arm); +Cc: llvm, oe-kbuild-all
tree: https://github.com/davidhildenbrand/linux folded_pgtable
head: 898b37f4865d94ff198bb62dfe2517a6d1b7d44e
commit: 898b37f4865d94ff198bb62dfe2517a6d1b7d44e [13/13] mm/pgtable: catch abuse of folded dummy pgd_t/p4d_t/pud_t
config: i386-defconfig (https://download.01.org/0day-ci/archive/20260704/202607041001.lwd0KBN0-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260704/202607041001.lwd0KBN0-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607041001.lwd0KBN0-lkp@intel.com/
All errors (new ones prefixed by >>):
WARN /zdci/src/lkp/lib/log.sh:131:in `log_warn': /opt/cross/rustc-1.96.0-bindgen-0.72.1 doesn't exist
from /zdci/src/kernel-tests/lib/debug.sh:164: kbuild_log_warn
from /zdci/src/kernel-tests/lib/kbuild.sh:3371: export_rust_path
from /zdci/src/kernel-tests/lib/kbuild.sh:3361: export_compiler_path
from /zdci/src/kernel-tests/lib/kbuild.sh:3840: invoke_make
from /zdci/src/kernel-tests/lib/kbuild.sh:4022: make
from /zdci/src/kernel-tests/common.sh:202: redirect_error_to_screen
from /zdci/src/kernel-tests/common.sh:210: redirect_command_errors
from /zdci/src/kernel-tests/lib/kbuild.sh:5680: make_prepare
from /zdci/src/kernel-tests/lib/kbuild.sh:5909: test_kernel_build
from /zdci/src/kernel-tests/lib/builder/base.sh:442: builder_execute_build
from /zdci/src/kernel-tests/lib/kbuild.sh:6419: compile_one_config
from /zdci/src/kernel-tests/lib/builder/base.sh:88: builder_compile
from /zdci/src/kernel-tests/bisect-test-build-error.sh:101: main
In file included from arch/x86/kernel/asm-offsets.c:9:
In file included from include/linux/crypto.h:15:
In file included from include/linux/completion.h:12:
In file included from include/linux/swait.h:7:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/irqflags.h:18:
In file included from arch/x86/include/asm/irqflags.h:100:
In file included from arch/x86/include/asm/paravirt.h:10:
In file included from arch/x86/include/asm/paravirt_types.h:12:
In file included from arch/x86/include/asm/pgtable_types.h:354:
>> include/asm-generic/pgtable-nop4d.h:46:36: error: call to undeclared function 'pgd_val'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
46 | BUILD_BUG_ON(__builtin_constant_p(pgd_val(*pgd)));
| ^
include/asm-generic/pgtable-nop4d.h:46:36: note: did you mean 'pgd_bad'?
include/asm-generic/pgtable-nop4d.h:22:19: note: 'pgd_bad' declared here
22 | static inline int pgd_bad(pgd_t pgd) { return 0; }
| ^
include/asm-generic/pgtable-nop4d.h:53:36: error: call to undeclared function 'pgd_val'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
53 | BUILD_BUG_ON(__builtin_constant_p(pgd_val(*pgdp)));
| ^
In file included from arch/x86/kernel/asm-offsets.c:9:
In file included from include/linux/crypto.h:15:
In file included from include/linux/completion.h:12:
In file included from include/linux/swait.h:7:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/irqflags.h:18:
In file included from arch/x86/include/asm/irqflags.h:100:
In file included from arch/x86/include/asm/paravirt.h:10:
In file included from arch/x86/include/asm/paravirt_types.h:12:
In file included from arch/x86/include/asm/pgtable_types.h:380:
>> include/asm-generic/pgtable-nopud.h:53:36: error: call to undeclared function 'pgd_val'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
53 | BUILD_BUG_ON(__builtin_constant_p(p4d_val(*p4d)));
| ^
include/asm-generic/pgtable-nop4d.h:58:24: note: expanded from macro 'p4d_val'
58 | #define p4d_val(x) (pgd_val((x).pgd))
| ^
In file included from arch/x86/kernel/asm-offsets.c:9:
In file included from include/linux/crypto.h:15:
In file included from include/linux/completion.h:12:
In file included from include/linux/swait.h:7:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/irqflags.h:18:
In file included from arch/x86/include/asm/irqflags.h:100:
In file included from arch/x86/include/asm/paravirt.h:10:
In file included from arch/x86/include/asm/paravirt_types.h:12:
In file included from arch/x86/include/asm/pgtable_types.h:380:
include/asm-generic/pgtable-nopud.h:61:36: error: call to undeclared function 'pgd_val'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
61 | BUILD_BUG_ON(__builtin_constant_p(p4d_val(*p4dp)));
| ^
include/asm-generic/pgtable-nop4d.h:58:24: note: expanded from macro 'p4d_val'
58 | #define p4d_val(x) (pgd_val((x).pgd))
| ^
In file included from arch/x86/kernel/asm-offsets.c:9:
In file included from include/linux/crypto.h:15:
In file included from include/linux/completion.h:12:
In file included from include/linux/swait.h:7:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/irqflags.h:18:
In file included from arch/x86/include/asm/irqflags.h:100:
In file included from arch/x86/include/asm/paravirt.h:10:
In file included from arch/x86/include/asm/paravirt_types.h:12:
In file included from arch/x86/include/asm/pgtable_types.h:404:
>> include/asm-generic/pgtable-nopmd.h:55:36: error: call to undeclared function 'pgd_val'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
55 | BUILD_BUG_ON(__builtin_constant_p(pud_val(*pud)));
| ^
include/asm-generic/pgtable-nopud.h:66:24: note: expanded from macro 'pud_val'
66 | #define pud_val(x) (p4d_val((x).p4d))
| ^
include/asm-generic/pgtable-nop4d.h:58:24: note: expanded from macro 'p4d_val'
58 | #define p4d_val(x) (pgd_val((x).pgd))
| ^
In file included from arch/x86/kernel/asm-offsets.c:9:
In file included from include/linux/crypto.h:15:
In file included from include/linux/completion.h:12:
In file included from include/linux/swait.h:7:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/irqflags.h:18:
In file included from arch/x86/include/asm/irqflags.h:100:
In file included from arch/x86/include/asm/paravirt.h:10:
In file included from arch/x86/include/asm/paravirt_types.h:12:
In file included from arch/x86/include/asm/pgtable_types.h:404:
include/asm-generic/pgtable-nopmd.h:63:36: error: call to undeclared function 'pgd_val'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
63 | BUILD_BUG_ON(__builtin_constant_p(pud_val(*pudp)));
| ^
include/asm-generic/pgtable-nopud.h:66:24: note: expanded from macro 'pud_val'
66 | #define pud_val(x) (p4d_val((x).p4d))
| ^
include/asm-generic/pgtable-nop4d.h:58:24: note: expanded from macro 'p4d_val'
58 | #define p4d_val(x) (pgd_val((x).pgd))
| ^
In file included from arch/x86/kernel/asm-offsets.c:14:
In file included from include/linux/suspend.h:5:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:98:11: warning: array index 3 is past the end of the array (that has type 'unsigned long[2]') [-Warray-bounds]
98 | return (set->sig[3] | set->sig[2] |
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/kernel/asm-offsets.c:14:
In file included from include/linux/suspend.h:5:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:98:25: warning: array index 2 is past the end of the array (that has type 'unsigned long[2]') [-Warray-bounds]
98 | return (set->sig[3] | set->sig[2] |
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/kernel/asm-offsets.c:14:
In file included from include/linux/suspend.h:5:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:114:11: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
114 | return (set1->sig[3] == set2->sig[3]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/kernel/asm-offsets.c:14:
In file included from include/linux/suspend.h:5:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:13:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:114:27: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
114 | return (set1->sig[3] == set2->sig[3]) &&
| ^ ~
arch/x86/include/asm/signal.h:24:2: note: array 'sig' declared here
24 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from arch/x86/kernel/asm-offsets.c:14:
In file included from include/linux/suspend.h:5:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:17:
vim +/pgd_val +46 include/asm-generic/pgtable-nop4d.h
43
44 static __always_inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
45 {
> 46 BUILD_BUG_ON(__builtin_constant_p(pgd_val(*pgd)));
47 return (p4d_t *)pgd;
48 }
49
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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